Remove unused deprecated methods.
Remove unused deprecated methods.

and some useless fields.

Change-Id: I5a57109dc1b584e96654e4079bcdca1ede24eb2a
Reviewed-on: http://gerrit.dmdirc.com/3314
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <711c73f64afdce07b7e38039a96d2224209e9a6c@dmdirc.com>

csmith/DMDirc-Plugins,csmith/DMDirc-Plugins,DMDirc/Plugins,csmith/DMDirc-Plugins,DMDirc/Plugins,csmith/DMDirc-Plugins,DMDirc/Plugins,DMDirc/Plugins,DMDirc/Plugins,csmith/DMDirc-Plugins